EP0560155B1 - Process for separating phthalimidoperoxycaproic acid (PAP) from solution(s) in organic solvents - Google Patents

Process for separating phthalimidoperoxycaproic acid (PAP) from solution(s) in organic solvents Download PDF

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Publication number
EP0560155B1
EP0560155B1 EP93103207A EP93103207A EP0560155B1 EP 0560155 B1 EP0560155 B1 EP 0560155B1 EP 93103207 A EP93103207 A EP 93103207A EP 93103207 A EP93103207 A EP 93103207A EP 0560155 B1 EP0560155 B1 EP 0560155B1
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EP
European Patent Office
Prior art keywords
pap
process according
organic solvent
solution
anyone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93103207A
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German (de)
English (en)
French (fr)
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EP0560155A1 (en
Inventor
Claudio Cavallotti
Claudio Troglia
Roberto Garaffa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Solvay Specialty Polymers Italy SpA
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Ausimont SpA
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Publication date
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Publication of EP0560155A1 publication Critical patent/EP0560155A1/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
    • C07D209/02—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom condensed with one carbocyclic ring
    • C07D209/44—Iso-indoles; Hydrogenated iso-indoles
    • C07D209/48—Iso-indoles; Hydrogenated iso-indoles with oxygen atoms in positions 1 and 3, e.g. phthalimide

Definitions

  • the present invention relates to a process for separating phthalimido-peroxycaproic acid (PAP) from solutions in organic solvents in which it is dissolved.
  • PAP phthalimido-peroxycaproic acid
  • the present invention relates to a process for separating phthalimido-peroxycaproic acid (PAP) from its solutions in chlorohydrocarbons used in order to prepare it, and from the solutions in the other organic solvents used for its subsequent purification.
  • PAP phthalimido-peroxycaproic acid
  • phthalimido-caproic acid is converted into the peroxyacid, by H2O2, in the presence of a strong acid, in a double-phase system, in the presence of an organic solvent constituted by a halogenated aliphatic chlorohydrocarbon selected from dichloromethane and trichloromethane.
  • the resulting PAP is recovered from the organic phase by low-temperature crystallization, or solvent removal under vacuum.
  • PAP recovered in that way can be purified by recrystallization or stripping, using organic solvents as disclosed in Italian Patent Application No. MI92-A-000 381 (filed on Feb. 21st, 1992).
  • Patent application FR-A-2,385,697 describes an improved process for preparing a peroxycarboxylic acid by oxidation of the corresponding carboxylic acid with hydrogen peroxide in an aqueous phase in the presence of a strong acid as catalyst.
  • the improvement consists in reducing reaction time by adding to the reaction mixture an inert solvent, such as methylene chloride, which is not soluble in water and is a good solvent for the peroxyacid, while the solvent capacity for the starting acid is scarce.
  • the peroxyacid is recovered by separation of the organic phase, and subsequent crystallization of the peroxyacid from the solvent.
  • the present Applicant found now that the organic solvents can be re-used by means of a novel process used as an alternative to the usual separation methods, such as low-temperature crystallization or vacuum evaporation. This novel process makes it possible the process to be carried out under maximum safety conditions.
  • the subject-matter of the present invention is a process for separating phthalimido-peroxycaproic acid (PAP) from a solution of PAP in an organic solvent, said organic solvent having a solubility in water equal to or lower than 10% by weight, which comprises:
  • the subject-matter of the present invention is a process for separating phthalimido-peroxycaproic acid (PAP) from solutions in organic solvents, characterized in that said process comprises the following steps:
  • the ratio of the aqueous medium to suspended PAP is comprised within the range of from 6 to 15 by weight, preferably of from 8 to 12 by weight.
  • the temperature of the aqueous medium to which the PAP solution is fed is preferably comprised within the range of from +30°C to 35°C.
  • the gauge pressure inside the reactor (R) is preferably comprised within the range of from 0.133 to 0.2 bars (from 100 to 150 mm H g ).
  • Exemplary organic solvents for PAP having a solubility in water equal to, or lower than, 10% by weight, and from which the separation of PAP is carried out, are chlorohydrocarbons, such as, e.g., dichloromethane and trichloromethane, aliphatic esters, such as, e.g., methyl acetate and ethyl acetate.
  • chlorohydrocarbons such as, e.g., dichloromethane and trichloromethane
  • aliphatic esters such as, e.g., methyl acetate and ethyl acetate.
  • the aqueous medium can be constituted by demineralized water, or aqueous solutions of inorganic salts, such as, e.g., Na2SO4, MgSO4, (NH4)2SO4. If an aqueous solution of inorganic salts is used, the solution can have a concentration comprised within a wide range, preferably of from 10 to 40%.
  • the aqueous medium can contain small amounts (0.1-3%) of substances acting as acidity neutralizers, or metal ion sequestering agents, such as, e.g., sodium or potassium salts of citric, tartaric, phosphoric, phthalic acids, or NaOH, Na2CO3, and so forth.
  • the inert gas used in the process can be, e.g., N2, CO2, and their mixtures.
  • the solvents of PAP solutions are recovered according to the process of the present invention, in a system of condensers (C) kept at a temperature not lower than 0°C, in order to prevent water entrained by the organic solvents, from solidifying.
  • the system of condensers (C) continuously subtracts a portion of the organic solvents from the recycled gas, in such a way as to allow them to be completely recovered at the end of the operation.
  • PAP is recovered by filtration from an aqueous medium, as a crystalline powder, or granular solid, and is subsequently washed with demineralized water and dried in a desiccator (CaCl2).
  • the process according to the present invention can also be performed continuously.
  • the stirred PAP suspension can be drawn continuously, and the aqueous medium and PAP can be refilled.
  • the PAP separated by means of this process is of good purity. Its purity is comprised within the range of from 96 to 99% by weight.
  • the process makes it possible the organic solvents to be recovered with a rate of 98% and at such a purity level that they can be used again in the subsequent processes for PAP separation or purification.
  • the process according to the present invention is a novel separation method and can be adopted jointly with the process for PAP preparation as disclosed in European Patent Application No. 490,409.
  • the process of the present invention makes it possible the steps in question to be carried out under maximal safety conditions, both avoiding environmental pollution problems and all those problems which are connected with possible risks of fires or explosions owing to the possible flammability of the used organic solvents.
  • the organic solvent i.e., the ester
  • Example 6 the solvent of the solution containing 400 g (14.98%) of PAP and 84.8% of ethyl acetate was evaporated under vacuum in a rotational evaporator at a temperatue of 37°C, under a residual pressure of 0.027 bars (20 mm H g ).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Indole Compounds (AREA)
EP93103207A 1992-03-10 1993-03-01 Process for separating phthalimidoperoxycaproic acid (PAP) from solution(s) in organic solvents Expired - Lifetime EP0560155B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI920539A IT1254240B (it) 1992-03-10 1992-03-10 Procedimento per la separazione dell'acido ftalimmido perossicaproico da soluzioni di solventi organici
ITMI920539 1992-03-10

Publications (2)

Publication Number Publication Date
EP0560155A1 EP0560155A1 (en) 1993-09-15
EP0560155B1 true EP0560155B1 (en) 1996-05-08

Family

ID=11362338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93103207A Expired - Lifetime EP0560155B1 (en) 1992-03-10 1993-03-01 Process for separating phthalimidoperoxycaproic acid (PAP) from solution(s) in organic solvents

Country Status (6)

Country Link
EP (1) EP0560155B1 (it)
JP (1) JP3353843B2 (it)
AT (1) ATE137746T1 (it)
DE (1) DE69302509T2 (it)
ES (1) ES2087592T3 (it)
IT (1) IT1254240B (it)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1277685B1 (it) 1995-12-21 1997-11-11 Ausimont Spa Procedimento per la riduzione di acqua e di impurezze polari in acidi immido-alcanpercarbossilici
ITMI20021537A1 (it) 2002-07-12 2004-01-12 Ausimont Spa Acidi immidoalcanpercarbossilici
DE102004024274A1 (de) * 2004-05-15 2005-12-01 Basf Ag Verfahren zur Herstellung einer Lösung von reinem Triethylendiamin (TEDA)
EP1760141A1 (en) 2005-09-06 2007-03-07 SOLVAY (Société Anonyme) Coated peroxycarboxylic acid granules, process for their preparation and their use in detergent, bleach or disinfection applications

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4172086A (en) * 1977-03-28 1979-10-23 Fmc Corporation Process for the manufacture of peroxycarboxylic acids
IT1233846B (it) * 1988-01-20 1992-04-21 Ausimont Spa Perossiacidi immido aromatici
DE3823172C2 (de) * 1988-07-08 1998-01-22 Hoechst Ag omega-Phthalimidoperoxihexansäure, Verfahren zu dessen Herstellung und dessen Verwendung
GB8830234D0 (en) * 1988-12-24 1989-02-22 Interox Chemicals Ltd Peroxycarboxylic acids
GB8911957D0 (en) * 1989-05-24 1989-07-12 Interox Chemicals Ltd Peroxyacid manufacture
DE4003309A1 (de) * 1990-02-05 1991-08-08 Hoechst Ag Verfahren zur kontinuierlichen herstellung von imidoperoxicarbonsaeuren
IT1245308B (it) * 1990-12-13 1994-09-19 Ausimont Spa Processo per la produzione di un acido aril-immido-per-alcanoico

Also Published As

Publication number Publication date
JP3353843B2 (ja) 2002-12-03
ES2087592T3 (es) 1996-07-16
ITMI920539A1 (it) 1993-09-10
DE69302509D1 (de) 1996-06-13
EP0560155A1 (en) 1993-09-15
DE69302509T2 (de) 1996-09-12
IT1254240B (it) 1995-09-14
JPH0616630A (ja) 1994-01-25
ITMI920539A0 (it) 1992-03-10
ATE137746T1 (de) 1996-05-15

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